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bp0016cpr14 | Embryonic and Placental Development | CPR2001

Functional analysis of autocrine and paracrine signalling at the uterine–conceptus interface in pigs

Jaeger L. A. , Johnson L. A. , Ka H. , Gadow J. G. , Burghardt R. C. , Spencer T. E. , Bazer F.W.

The complexity of implantation necessitates intimate dialogue between conceptus and maternal cells, and precise coordination of maternal and conceptus signalling events. Maternal and conceptus-derived steroid hormones, growth factors and cytokines, as well as integrins and their ligands, have important and inter-related roles in mediating adhesion between apical aspects of conceptus trophectoderm and maternal uterine luminal epithelium that leads to formation of an epithelioch...

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bp0004rdr1 | Follicular Development | REDR1998

Control of early ovarian follicular development

McNatty KP , Heath DA , Lundy T , Fidler AE , Quirke L , O'Connell A , Smith P , Groome N , Tisdall DJ

Early follicular growth refers to the development of an ovarian follicle from the primordial to early antral phase. In sheep and cows these phases of growth can be classified by the configuration of granulosal cells in the largest crosssection of the follicle as types 1 (primordial), la (transitory) 2 (primary), 3 and 4 (preantral) and 5 (early antral). Follicles classified as type 1 may be highly variable within each species with respect to number of granulosal cells an...

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bp0013cpr10 | Ovarian Function | CPR1989

The synthesis and actions of steroids and prostaglandins during follicular maturation in the pig

Ainsworth L. , Tsangt B. K. , Downey B. R. , Marcus G. J.

Summary. Our understanding of the synthesis and production of follicular steroids and prostaglandins (PG) in the pig is based largely on in-vitro studies with granulosa and theca interna tissues obtained from Graafian follicles at various stages of maturation. As the follicle enlarges before the LH surge, granulosa cells exhibit a decrease in FSH receptors and are less responsive to FSH in terms of cAMP production. Concurrently, there is an increase in gr...

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bp0014cpr7 | Ovarian and Uterine Function | CPR1993

Early uterine development in pigs

Bartol F. F. , Wiley A. A. , Spencer T. E. , Vallet J. L. , Christenson R. K.

The capacity of pig uterine tissues to recognize and respond to maternal and conceptus signals determines whether pregnancy can be established and defines the environment in which embryonic and fetal growth occur. Limits of uterine capacity may be defined genetically. However, the extent to which functional uterine capacity approaches genetic potential may be determined, in part, by the success of organizational events associated with growth, morphogenesis and cytodiffere...

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bp0018cpr34 | Breeding Management Programs for The Future | CPR2009

Responses to exogenous gonadotrophin treatment in contemporary weaned sows

Patterson J. , Cameron A. , Smith T. , Kummer A. , Schott R. , Greiner L. , Connor J. , Foxcroft G.R.

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bp0018cpr38 | State-of-The Art in Conceptus-Uterus Interactions/Early Pregnancy Signaling | CPR2009

Effect of progesterone antagonist RU486 on uterine progesterone receptor mRNA expression,embryonic development and ovarian function during early pregnancy in pigs

Mathew D. , Sellner E. , Okamura C. , Geisert R. , Anderson L. , Lucy M.

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bp0005rdr19 | Ovary-Uterus-Embryo Interactions | REDR2002

Regulation of embryo survival in cattle

Thatcher WW , Guzeloglu A , Meikle A , Kamimura S , Bilby T , Kowalski AA , Badinga L , Pershing R , Bartolome J , Santos JEP

Evidence is presented that bovine somatotrophin (bST) treatment of lactating dairy cows enhances both expression of oviductal insulin-like growth factor II (IGF-II) mRNA and endometrial insulin-like growth factor binding protein 3 (IGFBP-3) mRNA between day 3 and day 7 of the oestrous cycle. mRNA encoding growth hormone (GH) receptor in endometrial tissues increased between day 3 and day 7 of the oestrous cycle. The changes induced by bST treatment may contribute to stimulatio...

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bp0012cpr6 | Development of The Embryo and its Role in Pregnancy | CPR1985

Effects of the ovary and conceptus on uterine blood flow in the pig

Ford S. P. , Stice S. L. ,

Summary. Changes in uterine blood flow throughout pregnancy appear to be due to steroid-induced alterations in uterine arterial tone and contractility. Arterial contractility is a transient reduction in luminal diameter in response to nerve stimulation or to an alpha-1 adrenergic agonist, leading to short-term reduction in uterine blood flow. Tone is the pressure exerted by an arterial segment against an intraluminal flow (distensibility) and is considere...

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bp0002rdr11 | Inhibin | REDR1990